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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca5bd849af911ae1338612edf0184c6211ab33772ea682ea74ad2c2e6b83c720' 
  AND token = 'RLVFnpdHMmjyJRwjAorhH4i7ZpZsLHuwsnkRxPA+/Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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