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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ede1ca2b8d004f82f19d5c11f6ea8f975ebe8535ad5827362531154294f4f4dd' 
  AND token = '0kVp+lntJmAkC70xbyisU9akzvBdxHzXouDMx251Wt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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