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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0539c7efbf018c6f7215b9043a98dcfc2a519935b750e4ca03a1c1276808cd0' 
  AND token = 'XsLrDHMArdCGAumJVXC1MdCqeJ0HR8VLXK9aiYnYYM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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