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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'edd79ee73a4db1761e1ec3f1c9941d96cfecb7aad14ff6d96ed191c002962359' 
  AND token = 'ZQWGO4ZEm/6imdwJpB/DiRChvKT0KtaXmnEMNG5WpDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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