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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d5363833415ec89854138db4a65b98e3666e745d20a3d0708e6c883a5458b0b' 
  AND token = 'YYeC7qeP+Yo+USHBXFcf+/WnqWE9Pqk2rEBfQb8gLbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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