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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45c2d73afaf60a182196dad17a3c2add66c764c51cb7a668b197b28fc1377154' 
  AND token = '+emn1MTxFps2uk3SypqHJCqwVjsatHzxtTn2CI7mcyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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