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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1bb1b1a71ebf7d7cdfeac6132e35fa3ba370e729b232af4cbcfe557908a8562b' 
  AND token = 'chBx9aMmdFYkn92DqkRGzsBr04+SuXbADM8fxSYdPgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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