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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7bcb9cfcd17250fddf12aa25eea4588f90710a0d5c3a1aa8747e006a7d8e0721' 
  AND token = 'tcojL6dv8UI0bCTU4zggOrtDPi0lFUuZpEVf/hwB6TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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