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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '45dc296659f3bfa60516870ecc9e941a3e08e1de47a18e38da70de54c639b6a9' 
  AND token = 'QAFOj1u+RD20CYvQaldexI+A7ch8C7xQEsFKZ4BjpB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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