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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63d29582f26d08c52165c266ff3327a7d20e614edf9589b1050555fb2ea39192' 
  AND token = '8eVEVtE+k/pN5Ol2M7blIYL0ioxWI/qaDn+uapdZbyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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