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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '742d3d32b571c3ff44ad8443d08112528baa36ab5aa95709d77fe5534a734141' 
  AND token = 'F+qc6IKC4d2Tlu8P3yk0A61EJpCy7ETA/dsFBjBuug4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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