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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7b56a9bba86c18b3c4e7a0a0c47281965237362e3e3bd9b32461a47bd11c83d' 
  AND token = 'Wnc7rqWYXg3TD1pq6k+yqS7Op++TLJNaJGCdAQz2ENQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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