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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f126f168279de1fc9b41401892e2946687691e09894c67b1b3a7443b47a252f7' 
  AND token = 'mz2w0YD3ZywH9IROzbanhP9mMWJ+n34DqeeP9mw5aG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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