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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a3ec4ca826bd97dc2f284e367a3e4af7b0f5c2e4cc5fafc3c039f385cf4cbcc' 
  AND token = '5vtT3xeuxHzzTFKiCq4YeTXGQV4rKA17gd45G6Oh8C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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