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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '951fff17655434a9d1281368c89eb73b703af30f87475185891bb88fd7eaa4be' 
  AND token = '5h6/TZHAGQ4CXfi1iHDNDPg5McXG+kv433iRmoFpAPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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