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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c50ab38d3b4ab33b461b1a6376f3e2c18c4e70a6d9cd18e2f8ae7907a7d77439' 
  AND token = 'Qnzcbxtep/jjskZYCv8d+DYJSFfjFBQG7WAy1EYMQm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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