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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7838d6150164f696a319464a19ee43c36c007ab99f7a7a27bb0aa4e27364e4a' 
  AND token = 'hnn0y4c6rNr+Z/660xFtOLoBJp9a498ri/nnPdz0g4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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