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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '91b4bb0919e86133abeb9613581581b34d554b9f6da3ad06cdf4b503062c1d47' 
  AND token = '0tEYNSHWS7POJfE1rGCf1kQC53mlLyRYypf+ixHgqPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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