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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd8cc7c02ce2afa370423c8d7771e188bd191deee48fbd17db2e9715522d65cc' 
  AND token = 'BobShSssbfhespAlMUCGQwaMJ2T82UCpjXP2dgy9XIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}