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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7bafce417a93972faafd248ab92ee373a4b532daa1fc92188f42134f86f8567c' 
  AND token = 'P4svcel4e2UfLQbJC4RCk42nVcOICdEYc8mfgmbfMDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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