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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca1a51e08d33061f464a0932ac56a1e41adbbc587688ecc12a345ca5b8be5e41' 
  AND token = 'hi0/Z+Ak3ljvyYpfkvoj4bH7qvMxfE0fW3/kuHfr4qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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