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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7a80a1717c6ebbde0fee0b66a720f1b15700ffc5162a31a21d8810c5e1c736f' 
  AND token = 'YWYUfGaNA5O9QtZCadtMLRnyEfp8jqkWnQ1yrXJVscI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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