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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '041d87bdd36d9433674cb018595cea2cf891473ea92aedb76393df1a05ccb4e6' 
  AND token = 'z3BcocGZAxCy3songgjw9zcOAJJ1Tnhrksgr0LP3r8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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